Normally, HTML provides traditional sliders with linear shape such as the Input Range Object. This example shows how to create a round slider using D3.js.
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August 29, 2015 14:28
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Round slider
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| .circumference { | |
| fill: #fff; | |
| stroke: #f2f2f2; | |
| stroke-width: 5px; | |
| } | |
| .dot circle:hover { | |
| cursor: pointer; | |
| } | |
| .dot circle { | |
| fill: lightsteelblue; | |
| stroke: steelblue; | |
| stroke-width: 1.5px; | |
| } | |
| .dot circle.dragging { | |
| fill: red; | |
| stroke: brown; | |
| } |
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| <!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>D3.js Round Slider</title> | |
| <link rel="stylesheet" href="index.css"> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| </head> | |
| <body> | |
| <script src="index.js"></script> | |
| </body> | |
| </html> |
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| var width = 960, | |
| height = 500; | |
| var circumference_r = 100; | |
| var drag = d3.behavior.drag() | |
| .origin(function(d) { return d; }) | |
| .on("dragstart", dragstarted) | |
| .on("drag", dragged) | |
| .on("dragend", dragended); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g") | |
| .attr("transform", "translate(" + width/2 + "," + height/2 + ")"); | |
| var container = svg.append("g"); | |
| var circumference = container.append('circle') | |
| .attr('r', circumference_r) | |
| .attr('class', 'circumference'); | |
| handle = [{ | |
| x: 0, | |
| y: -circumference_r | |
| }]; | |
| handle_circle = container.append("g") | |
| .attr("class", "dot") | |
| .selectAll('circle') | |
| .data(handle) | |
| .enter().append("circle") | |
| .attr("r", 5) | |
| .attr("cx", function(d) { return d.x;}) | |
| .attr("cy", function(d) { return d.y;}) | |
| .call(drag); | |
| function dragstarted(d) { | |
| d3.event.sourceEvent.stopPropagation(); | |
| d3.select(this) | |
| .classed("dragging", true); | |
| } | |
| function dragged(d) { | |
| d_from_origin = Math.sqrt(Math.pow(d3.event.x,2)+Math.pow(d3.event.y,2)); | |
| alpha = Math.acos(d3.event.x/d_from_origin); | |
| d3.select(this) | |
| .attr("cx", d.x = circumference_r*Math.cos(alpha)) | |
| .attr("cy", d.y = d3.event.y < 0 ? -circumference_r*Math.sin(alpha) : circumference_r*Math.sin(alpha)); | |
| } | |
| function dragended(d) { | |
| d3.select(this) | |
| .classed("dragging", false); | |
| } |
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